function WN=Normaliza(Wa,Wp,TipoDeFiltro)

     switch(TipoDeFiltro)                        
            case 1              %%PASABAJOS
                WN=Wa/Wp;
            case 2              %%PASAALTOS
                WN=Wp/Wa;
            case 3              %%PASABANDA 
                WN=(Wa(1)-Wa(2))/(Wp(1)-Wp(2));
            case 4              %%RECHAZABANDA
                WN=(Wp(1)-Wp(2))/(Wa(1)-Wa(2)); 
     end
    
end